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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa38d4cf74864600c346e126c775c774028b982a4648ae6f6c12ba5f3b039bc' 
  AND token = '0LkogqsGuv8anUgykztOQuD6seQdDwGExJAV2yltff0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}